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Let a dialect own its reserved keywords, starting with DuckDB #1238

Job	Run time
Grammar Choice Conflicts	36s
Gradle Check (macos-latest)	4m 28s
Gradle Check (windows-latest)	5m 17s
Gradle Check (ubuntu-latest)	4m 34s
Maven Verify (windows-latest)	3m 35s
Maven Verify (ubuntu-latest)	3m 44s
Maven Verify (macos-latest)	6m 48s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	29m 2s